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UCC25660x Family 750kHz Wide VIN/VOUT Range LLC Controller Optimized for Light-Load Efficiency
SLUSES3B
October 2023 – July 2024
UCC25660
PRODUCTION DATA
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UCC25660x Family 750kHz Wide VIN/VOUT Range LLC Controller Optimized for Light-Load Efficiency
1
1
Features
2
Applications
3
Description
4
Device Comparison Table
5
Pin Configuration and Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
ESD Ratings
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics
6.6
Switching Characteristics
6.7
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Input Power Proportional Control
7.3.1.1
Voltage Feedforward
7.3.2
VCR Synthesizer
7.3.3
Feedback Chain (Control Input)
7.3.4
Adaptive Dead-Time
7.3.5
Input Voltage Sensing
7.3.5.1
Brown in and Brown out Tresholds and Options
7.3.5.2
Output OVP and External OTP
7.3.6
Resonant Tank Current Sensing
7.4
Protections
7.4.1
Zero Current Switching (ZCS) Protection
7.4.2
Minimum Current Turn-off During Soft Start
7.4.3
Cycle by Cycle Current Limit and Short Circuit Protection
7.4.4
Overload (OLP) Protection
7.4.5
VCC OVP Protection
7.5
Device Functional Modes
7.5.1
Startup
7.5.1.1
With HV Startup
7.5.1.2
Without HV Startup
7.5.2
Soft Start Ramp
7.5.2.1
Startup Transition to Regulation
7.5.3
Light Load Management
7.5.3.1
Operating Modes (Burst Pattern)
7.5.3.2
Mode Transition Management
7.5.3.3
Burst Mode Threshold Programming
7.5.3.4
PFC On/Off
7.5.4
X-Capacitor Discharge
7.5.4.1
Detecting Through HV Pin Only
8
Application and Implementation
8.1
Application Information
8.2
Typical Application
8.2.1
Design Requirements
8.2.2
Detailed Design Procedure
8.2.2.1
LLC Power Stage Requirements
8.2.2.2
LLC Gain Range
8.2.2.3
Select Ln and Qe
8.2.2.4
Determine Equivalent Load Resistance
8.2.2.5
Determine Component Parameters for LLC Resonant Circuit
8.2.2.6
LLC Primary-Side Currents
8.2.2.7
LLC Secondary-Side Currents
8.2.2.8
LLC Transformer
8.2.2.9
LLC Resonant Inductor
8.2.2.10
LLC Resonant Capacitor
8.2.2.11
LLC Primary-Side MOSFETs
8.2.2.12
Design Considerations for Adaptive Dead-Time
8.2.2.13
LLC Rectifier Diodes
8.2.2.14
LLC Output Capacitors
8.2.2.15
HV Pin Series Resistors
8.2.2.16
BLK Pin Voltage Divider
8.2.2.17
ISNS Pin Differentiator
8.2.2.18
TSET Pin
8.2.2.19
OVP/OTP Pin
8.2.2.20
Burst Mode Programming
8.2.2.21
Application Curves
8.3
Power Supply Recommendations
8.3.1
VCCP Pin Capacitor
8.3.2
Boot Capacitor
8.3.3
V5P Pin Capacitor
8.4
Layout
8.4.1
Layout Guidelines
8.4.2
Layout Example
8.4.2.1
Schematics
8.4.2.2
Schematics
9
Revision History
10
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
DDB|14
MPDC008
Thermal pad, mechanical data (Package|Pins)
Orderable Information
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Data Sheet
UCC25660x Family
750kHz Wide V
IN
/V
OUT
Range LLC Controller Optimized
for Light-Load Efficiency
1
Features
50kHz to 750kHz full-load switching frequency
IPPC control enables wide input and output LLC (WLLC) operation
Enhanced light load management:
High frequency pulse skip for improved light load efficiency
Low frequency burst for low standby power
Audible frequency range skip for reduced audible noise
Integrated PFC on/off control signal to help further reduce standby power
Internal resonant-capacitor voltage synthesizer for enhanced signal reliability and high startup frequency support
Automatic capacitive region avoidance
Adaptive soft start with minimized inrush current
Integrated high-voltage startup (
UCC256601
,
UCC256602
, and
UCC256604
)
X-capacitor discharge (
UCC256601
and
UCC256604
).
Integrated +0.6/-1.2A gate drive
Complete protections
50ns Over-Current Protection (OCP) - cycle-by-cycle current limit
Over-Voltage Protection (OVP), internal and external Over-Temperature Protection (OTP)
Input and VCCP UVLO with internal 19V VCCP Clamp
SOIC-14 package with removed pins for high-voltage clearance